Temperature-alarm.



A. GOLBSTEIN.

TEMPERATURE ALARM. APPLICATION FILED MAR. 28, 1910.

Patented Jan. 17, 1-911 V////A@ 1'/////// 9 W zfwrmmvsr UNITED -strnfi;a is i r i rnn r curios.

ALBERT oonns'rnm, or new YORK, N. Y., assrcnon TO 'INTEENATIQNAL anaemic rnorac'rron COMPANY, A coaroiwrron or new some TEMPERATURE-ALARM.

. Specification of Letters Patent.

Patented Jan. 17, 1911.

Application filed March 28, 1910. Serial No. 551,816.

To all whom "it may concern:

Be it known that I, ALBERT Gonos'rnm, a citizen of the United States, residing at New York, in the county of New York and State of New York, haveinvented a certain new and useful Improvement in TemperatureAlarms, of which the following is a specification.

The invention relates to that type of alarms in which an increase of temperature in the room or other locality to be protected acts upon a body of air confined in a pipe of small diameter disposed along the wall or ceiling of said room, to cause said air to act upon a diaphragm, and so to control an electrical circuit including an alarm device.

The invention consists in the construction whereby the device will operate despite a break in said pipe or a choking thereof at any point along its length. I

In the accompanying'drawingFigure l is a sectional View, showing the pipe in combination with two diaphragms, the construc tion being such as that upon the closing of a local circuit by either one or both of said diaphragms, the alarm is caused to sound.

Fig. 2 is a similar View, showing a modified form of the device in which each diaphragm operates a separate alarm device.

Similar numbers of reference indicate like parts.

1 is the pipe which is usually oi metal, having a bore of about 1/20 of an inch in diameter, and of any desired length. The ends of the pipe are received inplatcs 2, 3 of insulating material, on which are supportedthe metal diaphragms 4, 5-air chambers as thin as possible being formed be tween said diaphragms and said plates. The plates 2, 3 may be supported from a platform 6 of insulating material, through which extend two binding posts 7 and 8 which-respectively areelectrically connected to the diaphragms 4, 5. Also passing through the platform are binding posts 9, 10, the ends of which extend downward into proximity to the diaphragms 4, 5. In Fig. 1 the binding posts -7 and 8 are connectedby the wire 11', and the binding posts 9, 10 are connected by the wire 12. Extending between wires 11 and 12 is a shunt 13 which includes a battery 14 and any suitable alarm mechanism, such as a bell 15.

1* the modified form of my device shown in '1 g. 2, the binding post 10 instead of pass a nicating therewith.

ing through the platform 6 projects up' wardly through the supporting; plate 2 and is normally in contact with the diaphragm 5. Another binding post 16 passing through platform 6 is connected by wire 17 to binding post 10. The battery 14 is interposed in the wire 11 which connects binding posts 7 and 8-. Binding post 16 connects by wire 18 to a oint on wire 11 between battery 14 and binding post 7. Binding post 9 connects by wire 19 to a point on wire 11 on the opposite side of battery 14 and includes an alarm bell 15. A shunt 19 extends between wire 16 and wire 11 and includes another b'ell 20. In the supporting plates 2 and, formed vent holes 21.

The operation of theZEieWmeshoWn in Fig. 1 is as follows: Normzi y uponi ncrease of surrounding temperature, the air in pipe 3. is quickly expanded, producing an impulse which acts upon diaphragms 4 and .5 In rising, said diaphragms complete circuit from battery 14 to binding post 7, diahragin 4, binding post 9, to hell it} and Each to battery, and from battery 14, by wire 11, to binding post 8, diaphragm 5, post 10, wire 12, bell 1.5 and back to battery. If, however, a break should occur in the pipe at any point, or ii the pipe in any way should become choked at such point, then on one or the other side of the break or choke there will. always be a length of pipe sufficiently great to provide a body of air which will operate the diaphragm commu- In the case of a break,

the frictional resistance to of the pipe will be suliicient to cause the impulse acting on the diaphragm to be strong enough to operate the same: while in the case of a choke, the air in the longer portion of the pipe still remains confined. Thus, to illustrate, if the brake occurs at the point X in Fig. 1, then the length of pipe between the point X and the diaphragm 5 will contain the body of air which acts on the diaphragm 5. Similarly, if the break should occur at the point Y, then the operating part of the pipe would extend from Y to the diaphragm 4, and hence diaphragm 4 would be acted upon. On the other hand, if the break should occur at the point Z exactly in the middle of the pipe, then the oppositesides of the break would actuate the escape of air from the ruptured end of the longer portion from battery 14, to binding post 7, diaphragm 4, post 9, aid alarm bell 15. On the other hand;diaphl agm 5 normally closes circuit to binding post 10, and this circuit proceeds from battery 14-, by Wire 18, to binding post 16, gvire 17, binding post 10, dia hragm 5, post 8, wire 11, and so back to attery. This short-circuits the bell 520. 'When the diaphragm 5 is caused by the air impulse to move out or contact with post 10,

the shortcircuit is broken, and the bell circuit then proceeds from battery 14;, by wire 18, wire 19, bell 20, and Wire 11 back to battery, with the result that the bell is sounded.

It will be seen that diaphragm rsounds bell l5 and diaphragm 5 sounds bell 90. When the break or choke comes, for example, at Z in the pipe 1, for the reasons already explained in connection with Fig. 1, both diaphragms will be operated by the rise in surrounding temperature, and both bells Will sound. But if the break takes lace at X, then only the diaphragm 5 will e operated and in such case the bell 20 will sound, whereas if the break occurs at Y,

only the diaphragm a will be operated, and

hence only the bell 15 will sound. By this arrangement, therefore, the location of the ends, diaphragms respectively disposed in front of said ends, terminals in proximity to said diaphragms, and two electrical circuits each including a terminal, a diaphragm and an alarm device.

3. A temperature alarm apparatus comprising a pipe in loop form having open ends, diaphragms respectively disposed in front of said ends, terminals in proximity to said diaphragms, and two electrical circuits each including a terminal, a diaphragm and an alarm device, the said terminals being adjusted normally to open circuit at one diaphragm and close circuit at the other diaphragm.

In testimony whereof I have ailixed my signature in presence of two witnesses.

1 ALBERT GOLDSTEIN.

\Vitnesses GnirrnUnn T. lon'run, MAY T. MCGARRY. 

